Malicious PDF — malware analysis report

Static analysis result for SHA-256 620f3f0beb983486…

MALICIOUS

PDF

81.1 KB Created: 2021-02-27 09:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0037dd724804043004b63d93caea676c SHA-1: 943c0483a89765a3004a671468cda565c421adde SHA-256: 620f3f0beb983486e3446ca8b480ffef05f5fa645baa0bc0e7ac2e5d364d174a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains text related to 'Windows 10 free download', suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/123?utm_term=windows+10+free+download+full+version+2018+for+laptop PDF link annotation
    • http://teaitalis.space/nse_certification_in_financial_marketsvbqp6.pdfIn PDF document text
    • https://lilufegat.weebly.com/uploads/1/3/5/9/135965666/gasagatumup.pdfIn PDF document text
    • http://siondez.ru/3112733167l98fi.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/zawexofarukofuwibovewod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_6010f46d360ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5fe864fbc2ea5.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/ccc2ae15f681326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470985/normal_5fca7aab9d51a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fde7560cf6c3.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/gurudukozexifefosetom.pdfIn PDF document text
    • http://temppicture.xyz/roland_barthes_myth_todaycl6kq.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/d606eaec4f0bcbf.pdfIn PDF document text
    • http://chambrely.xyz/how_to_set_time_limits_on_kindle_firepksbs.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/56018997193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gegokuberil.rf.gd/bose_remote_codes_for_samsung_smart_tv.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/what_is_power_dissipation_in_cmos.pdfIn PDF document text
    • http://xonizud.epizy.com/bmvc_2019_template.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/rowavolesemagomovu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 5604 bytes
SHA-256: f883c436711bcf7c356930aea23d5ebba149573278e902ad762c91d5930621e2
font_01_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 10236 bytes
SHA-256: eaf0b59779f1efb441f61796e6a254dac18ec1f28d83a6490bec2c16a99974fc
font_02_sfnt_off000128dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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